Project description: Sum total of vacuum interlayer inner leakage rate and deflation rate; the unit is Pascal cubic meters per second (Pa·m3/s). Leak rate: under specified conditions, the quantity of flow that a kind of specified gas passes through the drain hole. the unit is Pascal cubic meters per second (Pa·m3/s). Deflation rate: under normal temperature status, quantity of gas that all surfaces of various materials in vacuum interlayer within unit time absorb. The unit is Pascal cubic meters per second (Pa·m3/s).
Application scope: Applicable to static evaporation rate measurement of vacuum insulated cryogenic pressure vessels, vacuum insulated gas cylinders and other vacuum insulated cryogenic equipments other than liquid hydrogen storage and transportation medium.
Executive standard: GB/T 18443.4-2010 vacuum heat insulated cryogenic equipment performance test method- Part 5: Leakage and Outgassing Rate Measurement
Principles and methods:
Calculate leak and outgassing rate through measuring the change value of static interlayer vacuum degree within a certain time interval at normal temperature. Equipment for use: vacuum meter (vacuum gauge tube)